A smaller defeat would have put them into the tournament semis.
The striker hasn't been named in the 18-strong squad for France.
Lizzie Roussel (formerly Cui) withdrew from the Tokyo Games, when she fell pregnant.
Sun will play alongside Grand Slam winner Erin Routliffe in doubles tennis at Paris.
New Zealand will field three eventers and a dressage rider.
The 50-year-old has teammates younger than his son.
The former netballer has score more tries on the sevens world series than any other woman.
She returns after a forgettable performance at Tokyo, due to a case of the "twisties".
The duo will become the third Kiwi combo to contest the event at the Olympics.
